Hi ruins (nice nick!),
I reported this a while ago. You need to download the new IB Plugin if you are using 2.50.
Zorro is reporting this bug here:
https://zorro-project.com/manual/en/bugs.htm

You can also use the PreRelease. This has the new plugin with it. Although the PreRelease has some issues. If you want to be on the save side, just download the new IB Plugin and replace it with the old one.
Hope that helps,
BS